/* backupfile.h -- declarations for making Emacs style backup file names
   Copyright (C) 1990-1992, 1997-1999 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; see the file COPYING.
   If not, write to the Free Software Foundation,
   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifndef BACKUPFILE_H_
#define BACKUPFILE_H_

/* When to make backup files. */
enum EBackupType
{
  EBT_None,              // Never make backups.
  EBT_Simple,            // Make simple backups of every file.
  EBT_NumberedExisting,  // Make numbered backups of files that already have 
                         // numbered backups, and simple backups of the others.
  EBT_Numbered           // Make numbered backups of every file.
};

#define VALID_BACKUP_TYPE(Type)	    \
  ((Type) == EBT_None			           \
   || (Type) == EBT_Simple			     \
   || (Type) == EBT_NumberedExisting \
   || (Type) == EBT_Numbered)

extern char const *simple_backup_suffix;

char *find_backup_file_name (const char*, enum EBackupType);
enum EBackupType get_version (const char* context, const char* arg);
enum EBackupType xget_version (const char* context, const char* arg);
void addext (char*, const char*, int);

#endif // BACKUPFILE_H_
